Fluid driven siren pressure pulse generator for MWD and flow mea

Details Fluid driven siren pressure pulse generator for MWD and flow mea Fluid driven siren pressure pulse generator for MWD and flow mea

1995-06-27

1997-06-03

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 84, 415 552, 7386179, G01V 140, H04B 1300

Patent

active

056361785

ABSTRACT:
A fluid-powered siren of the type used for communicating information between points of a wellbore. In one aspect, responsiveness of the siren's rotor to low flow rates is improved through application of greater torque to the siren rotor. Also, improved capturing and channeling action by the turbine rotor fins causes fluid flow to drive the turbine rotor and siren rotor combination more efficiently than it can drive a siren rotor directly as may be the case in other fluid-powered sirens. In another aspect, the system provides for control of the rotational speed of the siren rotor in instances wherein the fluid flow rate is too high. Control is affected by use of an epicyclical gear reducer which is positioned between the turbine rotor and the siren rotor to operably interconnect the two components.

REFERENCES:
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Attang et al, SPE/IAPC Drilling Conf., Feb. 23, 1993, pp. 149-159; abst. only herewith.

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